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Acquisitions - Additional Information (Detail) - USD ($) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 26, 2019 | Sep. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Common stock, shares outstanding | 44,969,021 |  | 44,969,021 | 38,375,407
Acquisition of goodwill | $ 151,238,000 |  | $ 151,238,000 | $ 119,880,000
Increased in value of premises and equipment | 799,000 |  |  |
Increase in value of intangibles | 127,000 |  |  |
Decrease in value of other assets | 932,000 |  |  |
Decrease in value of total deposits | $ 6,000 |  |  |
Salin Bank and Trust Company [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Exchange ratio per share |  | 23907.50% |  |
Cash paid for each share |  | $ 87,417.17 |  |
Common stock, shares outstanding |  | 275,000 |  |
Common stock issued |  | 6,563,697 |  |
Market closing price per share |  | $ 15.65 |  |
Estimated transaction value |  | $ 126,700,000 |  |
Costs related to the acquisition |  | 5,600,000 |  |
Total purchase price |  | 126,722,000 |  |
Net intangible assets acquired |  | 19,818,000 |  |
Acquisition of goodwill |  | $ 31,358,000 |  |
Core deposit intangible amortization period |  |  | 10 years |

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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to property, plant, and equipment acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 4A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=SL65897772-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116869197&loc=d3e4845-128472 + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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